package org.anyline.util;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class XssUtil {
	private static List<Pattern> patterns = new ArrayList<Pattern>();
	static {
		List<Object[]> regexps = new ArrayList<Object[]>();
		regexps.add(new Object[] { "<(no)?script[^>]*>.*?</(no)?script>", Pattern.CASE_INSENSITIVE });
		regexps.add(new Object[] { "eval\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL }); 
		regexps.add(new Object[] { "expression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL });
		regexps.add(new Object[] { "(javascript:|vbscript:|view-source:)*", Pattern.CASE_INSENSITIVE });
		regexps.add(new Object[] { "<(no)?iframe[^>]*>.*?</(no)?iframe>", Pattern.CASE_INSENSITIVE });
		regexps.add(new Object[] { "<(no)?iframe[^>]*>", Pattern.CASE_INSENSITIVE });
		//regexps.add(new Object[] { "<(\"[^\"]*\"|\'[^\']*\'|[^\'\">])*>", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL });
		regexps.add(new Object[] {"(window\\.location|window\\.|\\.location|document\\.cookie|document\\.|alert\\(.*?\\)|window\\.open\\()*", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL });
		regexps.add(new Object[] {"<+\\s*\\w*\\s*(oncontrolselect|oncopy|oncut|ondataavailable|ondatasetchanged|ondatasetcomplete|ondblclick|ondeactivate|ondrag|ondragend|ondragenter|ondragleave|ondragover|ondragstart|ondrop|onerror=|onerroupdate|onfilterchange|onfinish|onfocus|onfocusin|onfocusout|onhelp|onkeydown|onkeypress|onkeyup|onlayoutcomplete|onload|onlosecapture|onmousedown|onmouseenter|onmouseleave|onmousemove|onmousout|onmouseover|onmouseup|onmousewheel|onmove|onmoveend|onmovestart|onabort|onactivate|onafterprint|onafterupdate|onbefore|onbeforeactivate|onbeforecopy|onbeforecut|onbeforedeactivate|onbeforeeditocus|onbeforepaste|onbeforeprint|onbeforeunload|onbeforeupdate|onblur|onbounce|oncellchange|onchange|onclick|oncontextmenu|onpaste|onpropertychange|onreadystatechange|onreset|onresize|onresizend|onresizestart|onrowenter|onrowexit|onrowsdelete|onrowsinserted|onscroll|onselect|onselectionchange|onselectstart|onstart|onstop|onsubmit|onunload)+\\s*=+", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL });

		String regex = null;
		Integer flag = null;
		int arrLength = 0;
		for (Object[] arr : regexps) {
			arrLength = arr.length;
			for (int i = 0; i < arrLength; i++) {
				regex = (String) arr[0];
				flag = (Integer) arr[1];
				patterns.add(Pattern.compile(regex, flag));
			}
		}
	}
	/**
	 * 过滤字符
	 * @param value
	 * @return
	 */
	public static String strip(String value) {
		if (BasicUtil.isNotEmpty(value)) {
			Matcher matcher = null;
			for (Pattern pattern : patterns) {
				matcher = pattern.matcher(value);
				if (matcher.find()) {
					value = matcher.replaceAll("");
				}
			}
			//value = value.replaceAll("<", "&lt;").replaceAll(">", "&gt;");
		}
		return value;
	}

	/**
	 * 检测是否存在非法字符 通过(没有非法字条)返回true
	 * @param value
	 * @return
	 */
	public static boolean check(String value) {
		if (BasicUtil.isNotEmpty(value)) {
			Matcher matcher = null;
			for (Pattern pattern : patterns) {
				matcher = pattern.matcher(value);
				if (matcher.find()) {
					return false;
				}
			}
		}
		return true;
	}
	
}
